/Engine/Source/Runtime/InteractiveToolsFramework/Public/BaseGizmos/GizmoInterfaces.h
Utility function that always returns a 3D coordinate system (ie plane normal and perpendicular axes). Internally callsGetTangentVectors()if available, otherwise constructs arbitrary mutually perpendicular vectors.
void GetAxisFrame ( FVector & PlaneNormalOut, FVector & PlaneAxis1Out, FVector & PlaneAxis2Out ) const